Excitation Amplitude/Phase Sensitivity in Circularly Polarized Hexagonal S-Band Antenna

A probe-fed circularly polarized hexagonal patch antenna with dual feed configuration is designed and presented for analyzing amplitude and phase sensitivity. The hexagonal patch antenna is excited with a fundamental frequency of 2.45 GHz through two feeds separated by an angle of 90° and 90° phase shift. The probe feed positions are optimized along the X- and the Y-direction of the patch antenna plane with and without simultaneous excitation. The sensitivity of circular polarization purity towards change in amplitude and phase of excitation signal is studied for a dual port hexagonal S-Band antenna.